<template>
  <div class="bottom-bar">
    <div class="check-content">
      <check-button
        :is-checked="isSelectAll"
        class="check-button"
        @click.native="checkClick"/>
      <span>全选</span>
    </div>
    <div class="price">
      合计:￥{{totalPrice}}
    </div>
    <div class="calculate" @click="calcClick">
      去结算({{checkLength}})
    </div>
  </div>
</template>

<script>
import CheckButton from "components/content/checkButton/CheckButton";

import {mapGetters} from 'vuex'

export default {
  name: "CartBottomBar",
  components: {
    CheckButton
  },
  computed: {
    ...mapGetters(['cartList']),
    totalPrice() {
      return this.cartList.filter(item => {
        return item.checked
      }).reduce((preValue, item) => {
        return preValue + item.price * item.count
      }, 0).toFixed(2)
    },
    checkLength() {
      return this.cartList.filter(item => {
        return item.checked
      }).length
    },
    isSelectAll() {
      if(this.cartList.length === 0) return false

      // 1. 使用filter
      // return !(this.cartList.filter(item => !item.checked).length)

      // 2. 使用find函数
      // return !this.cartList.find(item => !item.checked)

      // 3. 普通遍历
      for (let item of this.cartList) {
        if (!item.checked) {
          return false
        }
      }
      return true
    }
  },
  methods: {
    checkClick() {
      // 点击全选按钮：
      // 1. 如果原来都是选中，点击就一次，全部不选中
      // 2. 如果原来都是不选中（某些不选中），全部选中

      if (this.isSelectAll) { // 全部选中
        this.cartList.forEach(item => item.checked = false)
      } else { // 有部分或者全部不选中
        this.cartList.forEach(item => item.checked = true)
      }

      // 这里不可以做简化,是错误的
      // this.cartList.forEach(item => item.checked = !this.isSelectAll)
    },
    calcClick() {
      if (!this.isSelectAll) {
        this.$toast.show('请选择购买的商品', 2000)
      }
    }
  }
}
</script>

<style scoped>
  .bottom-bar {
    position: relative;
    display: flex;
    height: 40px;
    line-height: 40px;
    background-color: #eeeeee;
    font-size: 14px;
  }

  .check-content {
    display: flex;
    align-items: center;
    margin-left: 10px;
    width: 60px;
  }

  .check-button {
    width: 20px;
    height: 20px;
    line-height: 20px;
    margin-right: 5px;
  }

  .price {
    flex: 1;
    margin-left: 15px;
    font-size: 16px;
  }

  .calculate {
    width: 100px;
    background-color: orangered;
    color: #ffffff;
    text-align: center;
  }
</style>
